This signal function returns the SPI byte send plus 1 on the next
SPI transfer.

SPI_OUT VTREGData Type: unsigned int

The SPI_OUT VTREG contains a byte output via the MCU SPI
(Serial Peripheral Interface) port. When your simulated program sends
a byte via SPI, the SPI_OUT VTREG is set with the value
output. You may monitor this VTREG in a simulation script. For
example:

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